The theory behind it is simple and it works, if you have the fortitude to stick with it for the long haul. You basically have to consciously make a lifestyle change. Besides, not many 20 year olds make $60,000 per year unless they were doing something illicit. Another option is to try and save a bit less, but do it for a longer period of time.
I know it worked for me although Slice thinks I can't afford a Marquis Jet Card from NetJet.